Movable or removable closures – With means mounting closure for swinging – With latch or lock
Patent
1992-11-23
1994-02-08
Kannan, Philip
Movable or removable closures
With means mounting closure for swinging
With latch or lock
49383, 49400, 49465, E05C 900
Patent
active
052839796
ABSTRACT:
An improved locking feature for a watertight hatch incorporates a positive break-open feature to facilitate opening when the hatch is jammed with ice and/or debris. A plurality of radially extending/retracting locking bars cooperate with closing cams such that, when the bars are extended, the hatch is drawn into tight engagement with a sealing gasket. When the locking bars are fully retracted, in order to release the hatch for opening, at least selected ones of the locking bars cooperate with opening cam means whereby full retraction of the bars forcibly displaces the hatch in an opening direction with a high mechanical advantage, initially breaking the hatch free of any restricting ice formation or packed debris. Thereafter, the hatch may be readily opened by being manually lifted in a conventional manner. The arrangement makes it entirely feasible to configure the hatch cover to be flush with its surroundings, so as to be useable in sidewalks, for example, where there may be heavy pedestrian traffic.
REFERENCES:
patent: 942270 (1909-12-01), Legge
patent: 1104670 (1914-07-01), Horn
patent: 1416308 (1922-05-01), Silverman et al.
patent: 2197824 (1940-04-01), Young
patent: 2319982 (1943-05-01), Fralinger
patent: 2473065 (1949-06-01), Miller
patent: 2488524 (1949-11-01), Castellano
patent: 4121383 (1978-10-01), Holmes et al.
patent: 4523407 (1985-06-01), Miller
patent: 4964755 (1990-10-01), Lewis et al.
Presray Catalog, "Watertight Doors, Barriers, and Hatches", 3 pages, excerpt Sep. 1991.
Carlson Edward R.
Elwell Robert
Kannan Philip
The Presray Corporation
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